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Sorry, I tested and practiced successfully. Thank you for listening to my thoughts while I was reasoning through it. I managed to get it working, and that image shows the result I achieved

Essentially, I successfully combined two ISPs, and it provided double the bandwidth compared to a 1Gb port.

Thank you for replying to my post. I understand the issues you mentioned. Okay, now I will explain in more detail and more specifically.

First of all...

Purpose: I want my clients to be able to change their gateway manually and choose the internet provider they prefer. Therefore, using only one OPNsense instance is not possible, since it only has one interface within the same subnet — in this case, 172.16.0.1/23.

Solution: I have set up a Proxmox server and created 3 virtual machines with OPNsense installed:

VM1 - OPNsense1: WAN1 connects via PPPoE to ISP1, LAN interface is 172.16.0.1/23

VM2 - OPNsense2: WAN2 connects via PPPoE to ISP2, LAN interface is 172.16.0.2/23

VM3 - OPNsense3: LAN interface is 172.16.0.3/23, and it has two additional interfaces on the same vmbr0 bridge as the LAN, used to access the gateways from VM1 and VM2

I added gateways 172.16.0.1 and 172.16.0.2 into OPNsense3 to use the Gateway Group feature (to combine both networks and increase bandwidth).

With that setup, I created a grouped gateway at Tier 1, with interface 172.16.0.3 routing through the grouped gateway.

When a client wants higher download speed, they can point their gateway to 172.16.0.3.
If they want to use ISP1, they can manually set their gateway to 172.16.0.1.
Similarly, if they prefer ISP2, they can change their gateway to 172.16.0.2.

Do you get what I mean?

I am using the latest version of OPNsense, installed as a VM on Proxmox.
My idea is:
   •   VM1 – OPNsense1: 172.16.0.1/23, LAN1 interface, WAN1 running PPPoE.
   •   VM2 – OPNsense2: 172.16.0.2/23, LAN2 interface, WAN2 running PPPoE.
   •   VM3 – OPNsense3: 172.16.0.3/23, LAN3 interface, WAN3 with gateways 172.16.0.1 and 172.16.0.2 to aggregate the networks.

However, I'm running into a problem: when I run a speedtest, the download speed is fine, but the upload speed is stuck at only 0.10 Mbps. If I change the WAN interface to DHCP so that it automatically gets an IP from the DHCP server on OPNsense1, then the upload speed is normal and full bandwidth is available. That workaround works, but the problem is that I have two OPNsense instances running PPPoE and I can't have both acting as DHCP servers.

Do you have any ideas on how to solve this?